Hi Dave,

It is unlikely going to be that easy. Usually there are also some
resonant circuits, or at least one, and these frequencies are pretty far
apart.

Here is what we did: I bought a modulator at Radio Shack for about $40.
It's output frequency can be programmed digitally via push button to any
channel in the UHF range. Then video and audio is fed from the VCR into
that modulator. Its RF signal is fed into the house distribution and now
we can watch videos at any TV in the house.

Regards, Joerg

http://www.analogconsultants.com

Hi Dave,

It is unlikely going to be that easy. Usually there are also some
resonant circuits, or at least one, and these frequencies are pretty far
apart.

Here is what we did: I bought a modulator at Radio Shack for about $40.
It's output frequency can be programmed digitally via push button to any
channel in the UHF range. Then video and audio is fed from the VCR into
that modulator. Its RF signal is fed into the house distribution and now
we can watch videos at any TV in the house.

Regards, Joerg

http://www.analogconsultants.com

Not what you want exactly but, take the RF output and put it into another
VCR. Select Channel 5 on that VCR's tuner. It will now take your old units
Channel 5 and put it out on Channel 3 or 4 (switch selectable). Or use the
newer VCR's A/V inputs if the old unit has A/V outputs. You probably have a
VCR or two lying around, so it won't cost you much.

"DaveC" wrote in message
al.net...
This Panasonic NV-2110 3/4-inch VCR outputs RF on CH 5 or CH 6
(switch-selectable). There is no other choice of output channel. (This is
an
(*old* VCR, circa 1973, much discrete circuitry.)

Is the determination of frequency as simple as changing the xtals for
these
channels? (RF mod circuit uses two xtals for these channels.)

If I want change the circuit such that video is output to RF CH 3 or 4, is
this a straightforward xtal swap? Recal required afterward?

Has anyone done this before?

Thanks,
--
DaveC

This is an invalid return address
Please reply in the news group

Not what you want exactly but, take the RF output and put it into another
VCR. Select Channel 5 on that VCR's tuner. It will now take your old units
Channel 5 and put it out on Channel 3 or 4 (switch selectable). Or use the
newer VCR's A/V inputs if the old unit has A/V outputs. You probably have a
VCR or two lying around, so it won't cost you much.

"DaveC" wrote in message
al.net...
This Panasonic NV-2110 3/4-inch VCR outputs RF on CH 5 or CH 6
(switch-selectable). There is no other choice of output channel. (This is
an
(*old* VCR, circa 1973, much discrete circuitry.)

Is the determination of frequency as simple as changing the xtals for
these
channels? (RF mod circuit uses two xtals for these channels.)

If I want change the circuit such that video is output to RF CH 3 or 4, is
this a straightforward xtal swap? Recal required afterward?

Has anyone done this before?

Thanks,
--
DaveC

This is an invalid return address
Please reply in the news group

Hi Dave,

If you go for that just make sure the channel setting is not lost during
a power outage. The Radio Shack version we have does keep the channel
memorized. You can also select cable frequency mode or terrestrial
(normal) TV channels. But not VHF, it is only UHF.

Regards, Joerg

http://www.analogconsultants.com

Hi Dave,

If you go for that just make sure the channel setting is not lost during
a power outage. The Radio Shack version we have does keep the channel
memorized. You can also select cable frequency mode or terrestrial
(normal) TV channels. But not VHF, it is only UHF.

Regards, Joerg

http://www.analogconsultants.com

After reading all the posts so far, the question not asked is 'why use the
RF output at all?'

jak


Kevin Carney wrote:
Not what you want exactly but, take the RF output and put it into
another VCR. Select Channel 5 on that VCR's tuner. It will now take
your old units Channel 5 and put it out on Channel 3 or 4 (switch
selectable). Or use the newer VCR's A/V inputs if the old unit has
A/V outputs. You probably have a VCR or two lying around, so it
won't cost you much.

"DaveC" wrote in message
al.net...
This Panasonic NV-2110 3/4-inch VCR outputs RF on CH 5 or CH 6
(switch-selectable). There is no other choice of output channel.
(This is an (*old* VCR, circa 1973, much discrete circuitry.)

Is the determination of frequency as simple as changing the xtals
for these channels? (RF mod circuit uses two xtals for these
channels.)

If I want change the circuit such that video is output to RF CH 3 or
4, is this a straightforward xtal swap? Recal required afterward?

Has anyone done this before?

Thanks,
--
DaveC

This is an invalid return address
Please reply in the news group

After reading all the posts so far, the question not asked is 'why use the
RF output at all?'

jak


Kevin Carney wrote:
Not what you want exactly but, take the RF output and put it into
another VCR. Select Channel 5 on that VCR's tuner. It will now take
your old units Channel 5 and put it out on Channel 3 or 4 (switch
selectable). Or use the newer VCR's A/V inputs if the old unit has
A/V outputs. You probably have a VCR or two lying around, so it
won't cost you much.

"DaveC" wrote in message
al.net...
This Panasonic NV-2110 3/4-inch VCR outputs RF on CH 5 or CH 6
(switch-selectable). There is no other choice of output channel.
(This is an (*old* VCR, circa 1973, much discrete circuitry.)

Is the determination of frequency as simple as changing the xtals
for these channels? (RF mod circuit uses two xtals for these
channels.)

If I want change the circuit such that video is output to RF CH 3 or
4, is this a straightforward xtal swap? Recal required afterward?

Has anyone done this before?

Thanks,
--
DaveC

This is an invalid return address
Please reply in the news group

Hi Dave,

If you can live with Ch3/4 that would be even cheaper. But we couldn't
because we wanted to distribute into the house coax network and there is
a strong station on Ch3, and a weaker one on Ch2. Other than that our
box looks similar, except for a couple 7-segment displays and progamming
buttons.

Regards, Joerg

http://www.analogconsultants.com

Hi Dave,

If you can live with Ch3/4 that would be even cheaper. But we couldn't
because we wanted to distribute into the house coax network and there is
a strong station on Ch3, and a weaker one on Ch2. Other than that our
box looks similar, except for a couple 7-segment displays and progamming
buttons.

Regards, Joerg

http://www.analogconsultants.com